Nokea
A competitive antagonist is a substance that:
- A. Interacts receptors and produces submaximal effect
- B. Binds to the same receptor site and progressively inhibits the agonist response
- C. Binds to the nonspecific sites of tissue
- D. Binds to one receptor subtype as an agonist and to another as an antagonist
Correct Answer: B
Rationale: Competitive antagonists compete for the same receptor site, reversibly inhibiting the agonist.
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A nurse in an emergency unit is reviewing the medical record of a client who is being evaluated for angle-closure Glaucoma. Which of the following findings are indicative of this condition?
- A. Insidious onset of painless loss of vision
- B. Gradual reduction in peripheral vision
- C. Severe pain around eyes
- D. Intraocular pressure 12 mm Hg
Correct Answer: C
Rationale: Angle-closure glaucoma presents with severe eye pain and elevated pressure, unlike the normal 12 mm Hg.
A 20-year-old boy suffered from a moderate aspirin toxicity he may be managed by promoting its renal excretion when infused with:
- A. Ascorbid acid
- B. Ammonium chloride
- C. Arginine chloride
- D. Sodium bicarbonate
Correct Answer: D
Rationale: Sodium bicarbonate alkalinizes urine, enhancing aspirin (a weak acid) excretion.
Patients who are being treated with epoetin alfa need to be monitored for the development of:
- A. Thrombocytopenia
- B. Neutropenia
- C. Hypertension
- D. Gout
Correct Answer: C
Rationale: Epoetin alfa can cause hypertension by increasing red cell mass; blood count issues or gout are less common.
According to traditional Chinese medicine, if a person who has a fever is given a herb that is yang in nature, such as golden seal, the patient's illness will:
- A. Get worse
- B. Get better
- C. Not be adequately treated
- D. Need additional herbs to treat the yang
Correct Answer: A
Rationale: A yang (warming) herb like golden seal would worsen a fever, a yang condition.
A nurse is caring for a client who has Depression and a new prescription for Venlafaxine. For which of the following adverse effects should the nurse monitor this client? (Select all that apply)
- A. Cough
- B. Dizziness
- C. Increased libido
- D. Invention
Correct Answer: B
Rationale: Venlafaxine can cause dizziness , decreased libido , and hypotension ; 'invention' seems a typo.